Debug

Paste raw bytes, or use \xNN escapes for control bytes (e.g., \x1B = ESC, \x07 = BEL). Click Feed to send the parsed bytes through the wasm VT52 parser in ONE boundary call. Click 64 KB Stress to demonstrate SC-4 (one feed() call for 65 536 bytes — observe the single DevTools Performance entry).

TX bytes (last 64):

(none yet — press any key on the terminal to see TX bytes)

Sending 0 files via SLIDE

Clear scrollback?

Wipes the 10,000-line history.

Visible screen is unaffected. Snaps to live tail if you're scrolled up.

Serial Configuration

On by default. The MicroBeast's Z80 UART uses host-side RTS as its CTS input for hardware auto-flow-control — without this, Z80→PC transmits (wakeup byte, ACKs, file data) are blocked at the Z80 UART. Turn this off if your hardware has RTS wired to a reset line instead. DTR is always de-asserted on connect (Pitfall #12 reset-pulse concern). Takes effect on the next Connect click.
Off by default — the picker only lists the Silicon Labs CP2102N (the chip on stock MicroBeast hardware). Turn this on if your MicroBeast uses a different USB-serial bridge (FTDI, CH340, CP2104) or you're connecting via a virtual COM port (USB-IP, Bluetooth-SPP, ser2net). Takes effect on the next Connect click.

MicroBeast default is 19200 8N1, no flow control. Single-tab ownership is enforced by Chromium — close any other Beastty tab that holds this port first.

Recent errors 
(no recent errors)

Browser-reserved Ctrl combinations

Ctrl+W, Ctrl+N, Ctrl+T are claimed by Chromium (close tab, new window, reopen closed tab) and cannot be intercepted by a web page. Use Ctrl+F4, Ctrl+Shift+N, or a different keybinding on the MicroBeast side if you need those control codes. Everything from Ctrl+A through Ctrl+Z (except W, N, T) is forwarded normally, as are Ctrl+@, Ctrl+[, Ctrl+\, Ctrl+], Ctrl+^, Ctrl+_.

Keyboard Shortcuts

About Beastty

Build
Built
SourceTBD

No telemetry. No data leaves your browser.

Requires a Chromium-based browser (Web Serial is a Chromium-only API).

SLIDE File Transfer

Received files land in your Downloads folder. Toggle this to pick a fixed destination.
No folder selected
\r appended automatically
When off, drops and picker selections begin transferring immediately. Filename collisions are auto-renamed.